Constraining neutrino physics with BBN and CMBR

Constraining neutrino physics with BBN and CMBR
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用 BBN 和 CMBR 约束中微子物理

DOI:
10.1103/physrevd.65.023511
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发表时间:
2001
期刊:
arXiv: Instrumentation and Methods for Astrophysics
影响因子:
--
通讯作者:
O. Pisanti
O. Pisanti
中科院分区:
--
文献类型:
--
作者:
S. Hansen;G. Mangano;A. Melchiorri;G. Miele;O. Pisanti

文献摘要

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我们对BOOMERanG和DASI实验中宇宙微波背景辐射各向异性的最新结果进行了似然分析,表明它们挑选出了有效数量的中微子,与标准的大爆炸核合成非常一致。我们还考虑了简并大爆炸核合成,以提供有效相对论自由度N ν,特别是中微子化学势ξ α的新界限。当包括超新星Ia数据时,我们发现,在2 σ, N ν≤7和- 0。01≤ξ e≤0。22, | ξµ,τ |≤2。6.
We perform a likelihood analysis of the recent results on the anisotropy of Cosmic Microwave Background Radiation from the BOOMERanG and DASI experiments to show that they single out an effective number of neutrinos in good agreement with standard Big Bang Nucleosynthesis. We also consider degenerate Big Bang Nucleosynthesis to provide new bounds on effective relativistic degrees of freedom N ν and, in particular, on neutrino chemical potential ξ α . When including Supernova Ia data we find, at 2 σ , N ν ≤ 7 and − 0 . 01 ≤ ξ e ≤ 0 . 22, | ξ µ,τ | ≤ 2 . 6.